Dynamo electric machine with improved cooling system



Nmio 3 i931 v, G, APPLE 1,83%4537 DYNAMO ELECTRIC MACHINE WITH IMPROVED COOLING SYSTEM Filed April 7, 1.950

Patented Nov. 3, 1931 UNITED STATES PATENT OFFICE VINCENT G. APPLE, F DAYTON, OHIO DYNAMIC ELECTRIC MACHINE WITH IMPROVED COOLIIfI'G SYSTEM:

Application filed April 7,1930. Serial No. 442,393;

1 to situations where the surrounding air is either too hot or contains dust or other foreign matter detrimental to the interior of the motor, or to situationswhere a high percentage of overload must be carried.

I attain this object in the structure hereinafter described, an illustrative embodiment being shown in the drawings wherein Fig. I is an elevation of a motor constructed according to m invention.

Fig. 2 is an axial section through the motor. 7 Similar numerals refer to similar parts throughout the several views.

The stator element 10 comprises a magnetizable core 11 composed of laminae 12,

wound about and in contact with the stator core, and a housing 16 of plastic compound molded about the core around the several turns of the cooling core and surrounding and penetrating the interstices of the winding.

The compound composing the housing is preferabl of a kind having a high degree of heat con uctivity but a low degree of electricalconductivit so that the portion sepa- Y 12, then the winding 13 is put on the core.

A length of metal-tubing is then wound around a suitable mandrel to compose the cooling coil 14, the" [ends of which are left extending as at,17j and 18. The cooling coil may first be filled with'natural resin or other suitable filler which may afterwards be readily melted and removed, then placed windings 13, a cooling'coil 14 of metal tubing rating the sever {turns of the winding will.

around the wound core preferably tightly against it, whereupon the structure is placed in a mold adapted to support the several parts in proper spaced relation, and the plastic compound is compressed through and about the core, winding and cooling coil to fill all voids within the winding and between the core and coil, completely coverin structure and forming the housing 16 c osed at the one end as at 19.

The plastic compound is hardened while under pressure in the mold after which the structure is removed therefrom. The filler in the cooling coil, which prevented it being crushed while molding was being effected, is tlien removed and the stator element is comp ete.

A hearing head 20 is secured to the open end of the stator element by bolts 21 and 'nuts 22. Head 20 carries two widely spaced apart bearings 23 within which shaft 24 is rotatably supported. The rotor 26 is secured in overhung fashion to shaft 24 by nut 27.

In operation the ends 17 and 18 of cooling coil 14 are connected to a source of supply of a suitable cooling fluid, as for instance to-a city water supply line, and during operation of the motor the coolant is constantly permitted to circulate through the coil. By a suitable valve in the line the degree to which the motor is cooled may be regulated.

Because of the fact that molding material having high heat conducting properties has been selected for housing 16, the heat is readily transferred from the windin 13 and from the core 11 to the cooling coil 14, since this material penetrates the winding, surrounding the individual turns thereof,

and also extends completely around the core and the turnsof the coolin coil.

Having described an em odiment of my invention, I claim: 7 i

1. A dynamo electric machine having cooling facilities comprising, a winding, a coil of hollow tubing adapted to have a coolant circulated therethrough adjacent said winding and a substantially continuous mass of insulation having high heat conductive progerties penetrating and coverin said .Win ing and surrounding said win mg and coil.

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2. A dynamo electric machine have cooling facilities comprising, a housing of molded insulation having high heat conductive properties, a winding, and a coil of hollow tubm adapted to have a coolant circulated theret rough adjacent said winding, said winding and said coil being buried in the insulation composing said housing.

3. A dynamo electric machine having cooling facilities com risin a completely enclosed housing 0 mol ed insulating material having hi h heat conducting properties, a magnetiza le core, a windin on said core, and a coil of hollow metal tu ing surrounding said core and winding and adapted to have a coolant circulated therethrou h said core, winding and coil being imbed ed in and completely surrounded by the insulation composing said housin In testimony whereof I a x my signature.

VINCENT G. APPLE. 

